linux-kernel - Re: [PATCH v2 9/9] mm: Consolidate common checks in hugetlb_mmap_check_and

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Message-ID: <202407301708.tn4PRNvn-lkp@intel.com>
Date: Tue, 30 Jul 2024 17:59:23 +0800
From: kernel test robot <lkp@...el.com>
To: Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org, Peter Xu <peterx@...hat.com>,
	Muchun Song <muchun.song@...ux.dev>,
	David Hildenbrand <david@...hat.com>,
	Donet Tom <donettom@...ux.ibm.com>,
	Matthew Wilcox <willy@...radead.org>,
	Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>,
	Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 9/9] mm: Consolidate common checks in
 hugetlb_mmap_check_and_align

Hi Oscar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on s390/features]
[also build test WARNING on akpm-mm/mm-everything deller-parisc/for-next linus/master v6.11-rc1 next-20240730]
[cannot apply to powerpc/next powerpc/fixes arnd-asm-generic/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Oscar-Salvador/mm-mmap-Teach-generic_get_unmapped_area-_topdown-to-handle-hugetlb-mappings/20240729-171449
base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
patch link:    https://lore.kernel.org/r/20240729091018.2152-10-osalvador%40suse.de
patch subject: [PATCH v2 9/9] mm: Consolidate common checks in hugetlb_mmap_check_and_align
config: mips-randconfig-r062-20240729 (https://download.01.org/0day-ci/archive/20240730/202407301708.tn4PRNvn-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240730/202407301708.tn4PRNvn-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202407301708.tn4PRNvn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/hugetlb.h:792,
                    from kernel/fork.c:53:
   arch/mips/include/asm/hugetlb.h: In function 'prepare_hugepage_range':
>> arch/mips/include/asm/hugetlb.h:20:24: warning: unused variable 'h' [-Wunused-variable]
      20 |         struct hstate *h = hstate_file(file);
         |                        ^


vim +/h +20 arch/mips/include/asm/hugetlb.h

50a41ff292fafe David Daney     2009-05-27  13  
78d6e4e8ea8700 Alexandre Ghiti 2018-10-26  14  #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
50a41ff292fafe David Daney     2009-05-27  15  static inline int prepare_hugepage_range(struct file *file,
50a41ff292fafe David Daney     2009-05-27  16  					 unsigned long addr,
50a41ff292fafe David Daney     2009-05-27  17  					 unsigned long len)
50a41ff292fafe David Daney     2009-05-27  18  {
50a41ff292fafe David Daney     2009-05-27  19  	unsigned long task_size = STACK_TOP;
50a41ff292fafe David Daney     2009-05-27 @20  	struct hstate *h = hstate_file(file);
50a41ff292fafe David Daney     2009-05-27  21  
50a41ff292fafe David Daney     2009-05-27  22  	if (len > task_size)
50a41ff292fafe David Daney     2009-05-27  23  		return -ENOMEM;
50a41ff292fafe David Daney     2009-05-27  24  	if (task_size - len < addr)
50a41ff292fafe David Daney     2009-05-27  25  		return -EINVAL;
50a41ff292fafe David Daney     2009-05-27  26  	return 0;
50a41ff292fafe David Daney     2009-05-27  27  }
50a41ff292fafe David Daney     2009-05-27  28  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki